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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2019
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign | The components of income before income taxes from continuing operations are presented below.
| 2019 |  | 2018 |  | 2017
| (in millions)
U.S. | $ | 78.4 |  |  | $ | 97.3 |  |  | $ | 82.7 |
Non-U.S. | 3.7 |  |  | (1.6 | ) |  | (4.2 | )
Income before income taxes | $ | 82.1 |  |  | $ | 95.7 |  |  | $ | 78.5 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of income tax (benefit) expense are presented below.
| 2019 |  | 2018 |  | 2017
| (in millions)
Current: |  |  |  |  |
U.S. federal | $ | 11.6 |  |  | $ | 25.7 |  |  | $ | 25.4 |
U.S. state and local | 3.9 |  |  | 7.1 |  |  | 4.0 |
Non-U.S. | 1.5 |  |  | 0.6 |  |  | 0.5 |
| 17.0 |  |  | 33.4 |  |  | 29.9 |
Deferred: |  |  |  |  |
U.S. federal | 2.5 |  |  | (42.6 | ) |  | (4.3 | )
U.S. state and local | (0.4 | ) |  | (1.0 | ) |  | (0.2 | )
Non-U.S. | (0.8 | ) |  | 0.3 |  |  | (1.2 | )
| 1.3 |  |  | (43.3 | ) |  | (5.7 | )
Income tax (benefit) expense | $ | 18.3 |  |  | $ | (9.9 | ) |  | $ | 24.2 |
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] | The table below presents a summary of the sale of Anvil, in millions.
Gross cash proceeds | $ | 305.7 |
Noncash proceeds | 1.9 |
Total proceeds | 307.6 |
Transaction expenses | (8.3 | )
Net proceeds | 299.3 |
Assets and liabilities disposed | (189.8 | )
Gain on sale, pre-tax | 109.5 |
Income tax | (41.6 | )
Gain on sale, net of tax | $ | 67.9 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliation between income tax expense at the U.S. federal statutory income tax rate and reported income tax expense from continuing operations is presented below.
| 2019 |  | 2018 |  | 2017
| (in millions)
Expense at U.S. federal statutory income tax rates of 21%, 24.5% and 35%, respectively | $ | 17.2 |  |  | $ | 23.4 |  |  | $ | 27.5 |
Adjustments to reconcile to income tax expense: |  |  |  |  |
State income taxes, net of federal benefit | 3.2 |  |  | 4.8 |  |  | 2.7 |
Domestic production activities deduction | — |  |  | (2.4 | ) |  | (4.5 | )
Tax credits | (1.8 | ) |  | (1.7 | ) |  | (1.4 | )
Nondeductible expenses, other than compensation | 1.3 |  |  | 0.5 |  |  | 0.6 |
Valuation allowances | 1.3 |  |  | 0.5 |  |  | 0.4 |
Foreign income taxes | 0.1 |  |  | — |  |  | 0.3 |
Nondeductible compensation | 0.3 |  |  | 0.2 |  |  | 0.5 |
Excess tax benefits related to stock compensation | (0.3 | ) |  | (0.6 | ) |  | (2.1 | )
Federal tax rate change | — |  |  | (42.5 | ) |  | (0.4 | )
Federal transition tax | (0.6 | ) |  | 7.5 |  |  | — |
Uncertain tax positions | (1.4 | ) |  | — |  |  | — |
Basis difference in foreign investment | (1.1 | ) |  | — |  |  | — |
Other | 0.1 |  |  | 0.4 |  |  | 0.6 |
Income tax (benefit) expense | $ | 18.3 |  |  | $ | (9.9 | ) |  | $ | 24.2 |
Schedule of Deferred Tax Assets and Liabilities | Deferred income tax balances are presented below.
| September 30,
| 2019 |  | 2018
| (in millions)
Deferred income tax assets: |  |  |
Inventory reserves | $ | 11.7 |  |  | $ | 10.4 |
Accrued expenses | 10.0 |  |  | 13.3 |
Pension | 1.7 |  |  | — |
Stock-based compensation | 2.7 |  |  | 3.3 |
State net operating losses | 2.8 |  |  | 3.2 |
Federal credit carryovers | 2.8 |  |  | 2.1 |
Other | 2.4 |  |  | 1.0 |
| 34.1 |  |  | 33.3 |
Valuation allowance | (2.8 | ) |  | (1.9 | )
Total deferred income tax assets, net of valuation allowance | 31.3 |  |  | 31.4 |
Deferred income tax liabilities: |  |  |
Intangible assets | 95.6 |  |  | 95.7 |
Pension | — |  |  | 2.3 |
Basis difference in foreign investment | 4.7 |  |  | — |
Other | 18.9 |  |  | 11.4 |
Total deferred income tax liabilities | 119.2 |  |  | 109.4 |
Net deferred income tax liabilities | $ | 87.9 |  |  | $ | 78.0 |
Balance sheet presentation: |  |  |
Deferred income taxes | $ | 88.0 |  |  | $ | 79.2 |
Less deferred tax assets included in other noncurrent assets | 0.1 |  |  | 1.2 |
Net deferred income tax liabilities | $ | 87.9 |  |  | $ | 78.0 |
Summary of Unrecognized Tax Benefits | The following table summarizes information concerning our gross unrecognized tax benefits.
| 2019 |  | 2018
| (in millions)
Balance at beginning of year | $ | 3.3 |  |  | $ | 3.0 |
Increases related to prior year positions | 2.0 |  |  | 0.1 |
Increases related to current year positions | 0.4 |  |  | 0.3 |
Decreases due to lapse in statute of limitations | (2.4 | ) |  | (0.1 | )
Balance at end of year | $ | 3.3 |  |  | $ | 3.3 |

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